Graphical user interface for a display screen or portion thereof



FIG. 1 The single FIGURE is a front view of a graphical user interfacefor a display screen or portion thereof showing my new design.

The broken line showing of the display screen or portion thereof, “AT &T,” and the “133.333333” forms no part of the claimed design.

The ornamental design for a graphical user interface for a displayscreen or a portion thereof, as shown and described.